Gree GMV-Pdm450W/NaB-M

DC Inverter Multi
VRF Service Manual
161
5.2.2 Abnormal System Pressure
S/N Class Trouble
Possible Cause
Troubleshooting
First-level reason Second-level reason Third-level reason
Description of Cause
Method of
Conrmation
Description of Cause Method of Conrmation
Description
of Cause
Method of
Conrmation
1
Abnormal
system
pressure
Discharge
pressure
abnormally
increases.
Not totally opened
1. Cut-off valve of outdoor unit
is not opened to the position,
which can allow maximum ow.
—— —— —— —— Manually check
Open the cut-off
valve to the position
which can allow
maximum ow
2
2.Pipeline of the system is blocked
Impurity
Discharge temp
of the system
abnormally
increases and the
low pressure is
too low(Judge
according
to reference
standard).
2.1Ggas pipe of the
system is blocked.
Along the ow direction
of refrigerants, the
difference of local
temperatures is great.
2.1.1 The welding
causes block.
Cut the pipe
to check.
Replace and weld
pipeline again.
3
2.1.2 There
are too many
impurities inside
the pipeline.
Replace and weld
pipeline again.
4
2.2Lliquid pipe
of the system
is blocked.
Along the ow direction
of refrigerants, the
difference of local
temperatures is great
or there is frost on
partial pipe.
—— ——
Replace and weld
pipeline again.
5
2.4 The connecting
pipe of indoor
unit is blocked.
Along the ow direction
of refrigerants, the
difference of local
temperatures is great
or there is frost on
partial pipe.
2.4.1 The welding
causes block.
Cut the pipe
to check.
Replace and weld
pipeline again.
6
2.4.2 There
are too many
impurities inside
the pipeline.
Replace and weld
pipeline again.